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diversity and expression of nitrogen fixation genes in bacterial symbionts of marine sponges.marine sponges contain complex assemblages of bacterial symbionts, the roles of which remain largely unknown. we identified diverse bacterial nifh genes within sponges and found that nifh genes are expressed in sponges. this is the first demonstration of the expression of any protein-coding bacterial gene within a sponge. two sponges ircinia strobilina and mycale laxissima were collected from key largo, florida and had delta(15)n values of c. 0-1 per thousand and 3-4 per thousand respectively. t ...200818761667
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